Wrote this indicator last weekend and have decided to share it. Installation instructions: 1) Close your MT4 2) Copy attached "Standard Deviation.ex4" to your MT4's AppData directory, e.g. C:\Users\swelz\AppData\Roaming\MetaQuotes\Terminal\676449683C76BB0F88D7085CCA122DEE\MQL4\Indicators. This could also simply be your installation directory, e.g. C:\Program Files\MetaTrader 4\MQL4\Indicators. 3) Open your MT4, expand "Custom Indicators" in the Navigator window, right click on "Standard Deviation" and click "Attach to chart". 4) Adjust StartTime and EndTime values accordingly. If your Broker's server time is already GMT then leave as is. 5) Enjoy! This will work only on 4 digit brokers, for now. I'd appreciate your feedback and suggestions, if any.